Vacuum membrane-pump.



FALKE VACUUM MEMBRANE PUMP.

. APPLlGATIoN FILED AUG. s, 190s.

fatented Apr 5, 19M) c essere.

' UNrrnn sra-rss fi rrr* .r .ritiri MARTIN FALK, OF COLGNE, GERIVIEJDTZ.

VACUUM MEMBRAJTE-PUMR Specification of ietters Patent.

Application tiled August 3. 1908. Serial No. 446.?'03

3e it linoun that l, MARTIN FALH, a subject. ot the `Kinv ot Prussia. German Emperor, residing at Cologne. in the Province ot the Rhine, Hii'igdom oi Prussia, Germanlmpire, have invented certain new and useful lnnnoreinents in VacuumMembranelunrps, oit which the following is a specilication. 5

rthis in rention relates to an improvement in vacuum memlnane pumiiis, and especiallyY to such piunps as are employed for the. removal olf dust)Y air, as for instance in the cleaning' of carpets. upholstered furniture and the like. ll'hen in pumps of this construction the pump chamber is bounded on the one hand by a h'Xcd partition and on the other hand by the membrane clamped between two plates. the membrane obviousl)v eaunot be extended orer its entire surface, but there must remain at the periphery an annular portion un xxtendeal, which in consequence of. its ji'ieldingi,l on the pr 'ure stroke causes the tormation of an ii'ijurious space and by producing folds must har eventually the result ot a preimiture destruction ot the. membrane.

ln order to ohviate these drawbacks. the presi-fut invention provides bead lilie projections in the ririnitiY of the unstretched portion ot the membrane which till up the otheru'ise existing injurious space-during the pressure stroke, and on the other hand conipel the membrane to assume ine vitabl \Y the. rounded shape free from folds and crevices. Further the invention provides means for securing certain further advantages in the use of such membranes as hereinafter set forth.

The drai'ring shows a vacuum membrane pump constructed according to the present invention. lt is assumed that the pumpis a double pump, the driving mechanism whereof needs no further description, and is placed in a closed casing a. The pump chambers are bounded on the one hand by the rigid Walls 7,, b1 and on the other hand by the membranes, c and (x1, which membranes are partiallg,T clamped between plates nl, f and d" f1. The aspiration and pressure valves (not shown) are placed in vthe valve .chambers .71, and h1. By means of the rods z' and r" an oscillating motion is imparted to the membrane, and it is assumed that the membrane c is shown at the end of its pressure stroke which ma)v be constrnetsr'd in one pim e the plates of and fr as illustrated in t drawing,

tt the end or the pressure slrolie side) the injurious spare which would oi. i Wise remain. will be almost entirelyv lilled by the bead and the eliicicncv ot' the pur oi! eourse thereby iiiereased. fit the time the men'ibrane is preventfa'l 'trom torni ing folds. which is'eepeeiall)v inuit-cable lso at the end of [he aspiration stroke side.) lli* this means injuries and the ra i wear ot' the membrane are eli'erliii'elr prf Vented. For the 'further protection membrane it is desirable lo keep the. catingg'oil used for the piuup mecha apart trom the membrai'ie. 'the luhrii l., lil

l r can be etlected in the illustrated :busti-urbeen action must injuriously atleet the working;

olf the pump. This is, however, prevented by providing at the louter part of the* spaces openings n and n, which prrnfent the otherwise occurring` alternations of pressure 'of the air present in the aforesaid spaces.

ln order that. noises may not enetrate to the outside, the openings 11. and ni terminr.e in a common hollow space .o at the toot of the pump frame, so that in a tzertain @use same time the n'ien'ibranes are in this manner entireli' shut o il trom tlngouter atmospliee so that no dustI or other dir @can reach the a and at the same time injuriousI compressioni;0 i

land raretaciions ogt the inelosed air ca be avoided. Moreover aniY oil flowing it'rom the stutlinp` boxes of the rods and il can escape through the openings n and nl into the si ,ce o so that it can collect therein and not injuriouslg7 affect 'the membranes. H the meinbranes resty free, that is to say, it they .edges of said membranes,

not inclosed and if moreover the pump mechanism is not in a space filled with oil,

the last described precautions are unnecessary. i

` Haring now particularly described and ascertained the nature of my said invention, I declare that what I claim is:

l. In a membrane Vacuum pump, the conil ination of pump chambers bounded on the one side by rigid Walls and on the other by ,membranes plates between which said membranes are clamped, rods forgiving oscillating motions to said membranes, an oil chamber through opposite Walls of which said rodsI pass. annular beads adjacent the outer edges ot ,said n'ien'ibranes, and end plates in position to prevent the oil from reachingl the membranes.v A

E. ln a membrane vacuum pump', the com- I bination of pump chambers bounded on the' one side by rigid Walls and on the other by membranes, plates between which said membrancs are elainpcd. rods for giving oscillating motions to said membranes, an oil chamber through opposite walls of which said rods pass, annularbeads adjacent the outer edges of said membranes, and end plates in position to prevent the oil from reaching the meniluanes, there being openings leadingl froml'he spaces between said platesand the membranes. A.

In a. membranevacuum pump, the combination of pump chambers bounded on the one side by rigid Walls and on the other by membranes, plates between Whichsaid membranes are clamped, rods for giving oscillating motionsto said membranes, an oil cham-1.v ber through'. opposite Walls of which said rods pass, annular Vbeads adjacent the outer end plates in position to prevent the oil from reaching the` membranes, there being openings leading from the spaces betweenv said plates and the membranes, and a chamber beneath the oil i chamber with which said openings communicate.'

4:. Ina double acting pump, the combination of a casing, the pump chambers of which are bounded on one side by rigid Walls,' membranes on the other side, means for imparting oscillatory motion to said membranes, annular beads adjacent the nonventing alternate compression an'd rarefaction of the inclosed air by the movement of the membranes.

6.' Ina double acting pump, the combination of a casing, the pump chambers of which are bounded on one side by rigid Walls, membranes on the other side, means for imparting oscillatory motion to said membranes, annular beads adjacent the nonmovable portions oi said membranes," the side Walls of said casing preventing oil from reaching said .membrganea means for preventing alternate compression and rarefaction of the inclosed air by the movement Y'of the membranes, and means coperating therewith for preventing noise. A

In testimony whereof I have signed my name to this specification in the presence of tivo subscribing Witnesses.

MARTIN FALK. Witnesses:

Louis VANDORN, H. .STELZER 

